Great horned owl

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Great Horned Owl
Great horned owl.jpg
Scientific classification
Kingdom Information
Domain Eukaryota
Kingdom Animalia
Subkingdom Bilateria
Branch Deuterostomia
Phylum Information
Phylum Chordata
Sub-phylum Vertebrata
Infraphylum Gnathostomata
Class Information
Superclass Tetrapoda
Class Aves
Sub-class Neornithes
Infra-class Neoaves
Order Information
Order Strigiformes
Family Information
Families Strigidae
Sub-family Striginae
Genus Information
Genus Bubo
Species Information
Species B. virginianus
Synonyms Strix virginiana
Population statistics
Conservation status Least concern[1]

Great horned owl (Bubo virginianus), largest "eared" owl, as well as the most wide-ranging, in the Western Hemisphere.

Description

Great horned owls are 25 inches in length, have a 55-inch wingspan, and weigh 2 to 5.5 pounds. Females are slightly larger than males. Color above varies among subspecies, from a whitish to dark brown and gray, and heavily-barred. The underparts are lighter brown to white, with thin dark horizontal bars at the tips of every feather; a thin vertical divide of white marks the center of the chest, giving a slight appearance of wearing a "vest". This whitish area spreads out and terminates at the neck.

The facial disk is prominent and well-defined, bearing a grayish to rufus color outlined in black. The eyes are large and yellow. The ear tufts, referred to sometimes as "horns", are dark in color, and raised or lowered depending on the bird's mood. The feet, zygodactyl in form, are feathered to the claws.

The call is hoo, hoo-hoo, HOO HOO, sonorous and far-carrying, and heard usually during sunset or dawn. The vocal pitch of the male lower than the female's.

Subspecies

  • Bubo virginianus elachistus; Mexico: Southern Baja California and Isla Espírito Santo
  • Bubo virginianus heterocnemis; Northeastern Canada south to Great Lakes region
  • Bubo virginianus lagophonus, sometimes referred to as B. v. algistus; Central Alaska to northeastern Oregon and Montana; winters south to Texas
  • Bubo virginianus mayensis; Mexico: Yucatán Peninsula
  • Bubo virginianus mesembrinus; Mexico: Isthmus of Tehuántepec to western Panama
  • Bubo virginianus nigrescens; Andes Mountains of Colombia to Ecuador and northwestern Peru
  • Bubo virginianus nacurutu, sometimes referred to as B. v. deserti; Eastern Colombia to the Guianas, northeastern Brazil, Bolivia and Argentina
  • Bubo virginianus pacificus; Coastal California to northwestern Baja California
  • Bubo virginianus pallescens; Deserts of California to Kansas and southern Mexico (Oaxaca)
  • Bubo virginianus saturatus; Coastal southwestern Alaska (Cook Inlet) to coastal central California
  • Bubo virginianus subarcticus; Yukon and northwestern British Columbia to Hudson Bay, Wyoming, North Dakota.
  • Bubo virginianus virginianus; Minnesota to Nova Scotia, south to Kansas, east Texas and Florida

Diet

Great horned owls feed on a variety of game, from grouse and rabbits to lizards, frogs, and insects. They are also the only bird of prey known to regularly hunt skunks. Like other owls, they possess "flutings" or "fimbriae"[2] on the leading edge of the primary wing feathers; in flight they effectively cut down the air turbulence caused by flapping, allowing the owls to strike their prey without making a sound. The prey is consumed whole if small enough, and passed through the digestive tract as a pellet; larger prey is broken down.

References

  1. http://www.iucnredlist.org/details/61752071/0
  2. http://www.owlpages.com/owls/articles.php?a=7